Preheat oven to fan assisted 180C / 200C / 400F / gas 6.
Peel the plantains and cut into slices on the diagonal.
Brush both sides of the slices with oil and put on a lightly oiled, lined baking tray and sprinkle on some salt
Bake for about 25 mins or until golden and the edges start turning brown. Make sure to turn the plantains at least once during baking.
Serve whilst warm.